#include <bits/stdc++.h>
using namespace std;
template <typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &pa) { is >> pa.first >> pa.second; return is; }
template <typename T> istream &operator>>(istream &is, vector<T> &vec) { for (auto &v : vec) is >> v; return is; }
template <typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa) { os << "(" << pa.first << "," << pa.second << ")"; return os; }
template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) { os << "["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template <typename T> ostream &operator<<(ostream &os, const deque<T> &vec) { os << "deq["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template <typename T> void resize_array(vector<T> &vec, int len) { vec.resize(len); }
template <typename T, typename... Args> void resize_array(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) resize_array(v, args...); }
template <typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }
template <typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }
long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; }
mt19937 mrand(random_device{}());
int rnd(int x) { return mrand() % x; }
#define rep(i, a, n) for (int i = a; i < (n); i++)
#define per(i, a, n) for (int i = (n)-1; i >= a; i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define sz(x) ((int)(x).size())
typedef vector<int> vi;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef double db;
#if DEBUG
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl;
#else
#define dbg(x)
#endif
class Solution {
public:
void Solve() {
int n,op;
while(cin>>n>>op) {
vector<vi> edges(n+1);
vector<vi> has_edge(n+1, vi(n+1, 0));
rep(from,1,n+1) {
int to;
while(cin>>to) {
if (to == 0) break;
edges[from].emplace_back(to);
has_edge[from][to] = 1;
}
}
// c -> clockwise, cc -> counter_clockwise
vector<vi> dp_c(n+1, vi(n+1, -1)), dp_cc(n+1, vi(n+1, -1));
// is s<k<e ?
auto between_range = [&] (int k, int s, int e, bool clockwise) {
if (clockwise) swap(s, e);
if (s==e) return k!=s;
int d1 = k-s; if (d1<0) d1 += n;
int d2 = e-s; if (d2<0) d2 += n;
return k!=s && d1 < d2;
};
function<int(int,int)> dfs_c,dfs_cc;
// [i,j)
// dp_c[i][j] = 1 + max(dp_c[k][j], dp_cc[k][i]) exists(i->k, j<k<i)
// dp_cc[i][j] = 1 + max(dp_cc[k][j], dp_c[k][i]) exists(i->k, i<k<j)
dfs_c = [&] (int i, int j) -> int {
if (dp_c[i][j] != -1) return dp_c[i][j];
dp_c[i][j] = 0;
for (int k : edges[i]) {
if (between_range(k, i, j, true)) {
dp_c[i][j] = max(dp_c[i][j], 1 + max(dfs_c(k, j), dfs_cc(k, i)));
}
}
return dp_c[i][j];
};
dfs_cc = [&] (int i, int j) -> int {
if (dp_cc[i][j] != -1) return dp_cc[i][j];
dp_cc[i][j] = 0;
for (int k : edges[i]) {
if (between_range(k, i, j, false)) {
dp_cc[i][j] = max(dp_cc[i][j], 1 + max(dfs_cc(k, j), dfs_c(k, i)));
}
}
return dp_cc[i][j];
};
int ans = 0, st = 0;
rep(i,1,n+1) {
if (dfs_c(i, i) > ans) {
ans = dfs_c(i, i);
st = i;
}
}
rep(i,1,n+1) {
rep(j,1,n+1) {
if (dp_c[i][j]==-1) dfs_c(i, j);
if (dp_cc[i][j]==-1) dfs_cc(i, j);
}
}
// dbg(dp_c);
// dbg(dp_cc);
if (op) {
vector<vi> dp_succ_c(n+1, vi(n+1, -1)), dp_succ_cc(n+1, vi(n+1, -1));
function<int(int,int)> dfs_succ_c = [&] (int i, int j) -> int {
if (i==j) return dp_succ_c[i][j]=0;
if (dp_succ_c[i][j] != -1) return dp_succ_c[i][j];
dp_succ_c[i][j] = -2;
for (int k : edges[i]) {
if ((k==j||between_range(k, i, j, true)) && dfs_succ_c(k, j) >= 0) {
dp_succ_c[i][j] = max(dp_succ_c[i][j], 1 + dfs_succ_c(k, j));
}
}
return dp_succ_c[i][j];
};
rep(i,1,n+1) {
rep(j,1,n+1) dfs_succ_c(i,j);
}
function<int(int,int)> dfs_succ_cc = [&] (int i, int j) -> int {
if (i==j) return dp_succ_cc[i][j]=0;
if (dp_succ_cc[i][j] != -1) return dp_succ_cc[i][j];
dp_succ_cc[i][j] = -2;
for (int k : edges[i]) {
if ((k==j||between_range(k, i, j, false)) && dfs_succ_cc(k, j) >= 0) {
dp_succ_cc[i][j] = max(dp_succ_cc[i][j], 1 + dfs_succ_cc(k, j));
}
}
return dp_succ_cc[i][j];
};
rep(i,1,n+1) {
rep(j,1,n+1) dfs_succ_cc(i,j);
}
// dbg(dp_succ_c);
// dbg(dp_succ_cc);
vi ansv(n+1);
// ans[i] = max(1+dp_succ_c[j][k]+1+max(dp_c[l][j], dp_cc[l][i])) exists(k->l, j<l<i), dp_succ_c[j][k]!=0
rep(j,1,n+1) {
int i = j + 1, k = i + 1;
if (i > n) i -= n; if (k > n) k-=n;
while(true) {
if (has_edge[i][j]) {
if (dp_succ_c[j][k] > 0) {
for (int l:edges[k]) {
if (between_range(l,i,j,true)) ansv[i] = max(ansv[i], 1+dp_succ_c[j][k]+1+max(dp_c[l][j], dp_cc[l][i]));
}
}
if (has_edge[k][j]) i = k;
k++; if (k > n) k-=n;
} else {
i++; k=i+1;
if (i > n) i -= n; if (k > n) k-=n;
}
if (k==j) break;
if (i==j) break;
}
}
// ans[i] = max(1+dp_succ_cc[j][k]+1+max(dp_cc[l][j], dp_c[l][i])) exists(k->l, i<l<j), dp_succ_cc[j][k]!=0
rep(j,1,n+1) {
int i = j - 1, k = i - 1;
if (i < 1) i += n; if (k < 1) k+=n;
while(true) {
if (has_edge[i][j]) {
if (dp_succ_cc[j][k] > 0) {
for (int l:edges[k]) {
if (between_range(l,i,j,false)) ansv[i] = max(ansv[i], 1+dp_succ_cc[j][k]+1+max(dp_cc[l][j], dp_c[l][i]));
}
}
if (has_edge[k][j]) i = k;
k--; if (k < 1) k+=n;
} else {
i--; k=i-1;
if (i < 1) i += n; if (k < 1) k+=n;
}
if (k==j) break;
if (i==j) break;
}
}
// dbg(ansv);
// ans = 0; st = 0;
rep(i,1,n+1) if (ansv[i]>ans) {
ans = ansv[i];
st = i;
}
}
cout << ans << endl;
cout << st << endl;
}
}
private:
};
// #define USACO 1
void set_io(const string &name = "") {
ios::sync_with_stdio(false);
cin.tie(nullptr);
#if FILE_IO || USACO
if (!name.empty()) {
freopen((name + ".in").c_str(), "r", stdin);
freopen((name + ".out").c_str(), "w", stdout);
}
#endif
}
int main() {
#if USACO
set_io("time");
#else
set_io("tmp");
#endif
Solution().Solve();
return 0;
}
Compilation message
race.cpp: In member function 'void Solution::Solve()':
race.cpp:150:17: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
150 | if (i > n) i -= n; if (k > n) k-=n;
| ^~
race.cpp:150:36: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
150 | if (i > n) i -= n; if (k > n) k-=n;
| ^~
race.cpp:162:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
162 | if (i > n) i -= n; if (k > n) k-=n;
| ^~
race.cpp:162:40: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
162 | if (i > n) i -= n; if (k > n) k-=n;
| ^~
race.cpp:172:17: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
172 | if (i < 1) i += n; if (k < 1) k+=n;
| ^~
race.cpp:172:36: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
172 | if (i < 1) i += n; if (k < 1) k+=n;
| ^~
race.cpp:184:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
184 | if (i < 1) i += n; if (k < 1) k+=n;
| ^~
race.cpp:184:40: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
184 | if (i < 1) i += n; if (k < 1) k+=n;
| ^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
500 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
348 KB |
Output is correct |
| 5 |
Correct |
1 ms |
348 KB |
Output is correct |
| 6 |
Correct |
3 ms |
348 KB |
Output is correct |
| 7 |
Correct |
4 ms |
344 KB |
Output is correct |
| 8 |
Correct |
4 ms |
604 KB |
Output is correct |
| 9 |
Correct |
5 ms |
604 KB |
Output is correct |
| 10 |
Correct |
14 ms |
600 KB |
Output is correct |
| 11 |
Correct |
8 ms |
604 KB |
Output is correct |
| 12 |
Correct |
48 ms |
1108 KB |
Output is correct |
| 13 |
Correct |
87 ms |
2352 KB |
Output is correct |
| 14 |
Correct |
78 ms |
2488 KB |
Output is correct |
| 15 |
Correct |
584 ms |
5712 KB |
Output is correct |
| 16 |
Correct |
693 ms |
5836 KB |
Output is correct |
| 17 |
Correct |
537 ms |
5712 KB |
Output is correct |
| 18 |
Correct |
105 ms |
3676 KB |
Output is correct |
| 19 |
Correct |
802 ms |
5936 KB |
Output is correct |
| 20 |
Correct |
839 ms |
5940 KB |
Output is correct |
